What I want to do is upload the process of a project that I have to my github but at the moment of doing it by means of cmd it marks me an error that I have not been able to solve.
I do not know what that error is because I can not get my project to remain on the gitHub
In the message it tells you to do pull first, surely there are changes in the remote repository that you do not have in the local. Try using git pull before reusing git push .
Create your project on github on the platform then follow the steps Follow those steps in case you continue to get error delete the git init folder and go back to do the process.
Commands for github upload projects
git init
git remote -v
git remote add origin link-del-proyecto-git
git add .
git add --all
git commit -m"Proyecto Final"
git push -u origin master
git push --force origin master